JP2007223799A - Elevator controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform regenerative braking for regenerative electric power without providing load resistance for energy consumption. <P>SOLUTION: In this elevator controller for converting alternating current into direct current by a rectifier 3 and converting it into alternating current by an inverter 5 to supply it to field winding wire of an electric motor 16 of permanent magnet synchronization type, a switching element 7 of an inverter 5 is maintained in a closed condition when stopping the electric motor 16 of permanent magnet synchronization type, a closed circuit is formed by the switching element 7, a power line 10, and the field winding wire of the electric motor, regenerative current is made to flow in the closed circuit, and regenerative energy is consumed by the field winding wire to brake the electric motor efficiently in a regenerative manner. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an elevator control device that converts an alternating current supplied from an alternating current power source into a direct current with a rectifier and further converts the direct current into an alternating current with an inverter and supplies the elevator car to an electric motor that moves up and down. The present invention relates to an elevator control device having a regenerative braking function that brakes the motor by converting rotational energy of the motor into regenerative power and consuming the regenerated power when the motor is stopped.

  In an elevator system provided in a building or the like, a rope having a car and suspension weights attached to both ends is hung on a sheave of an electric motor provided on the upper side of a hoistway. Usually, the weight of the suspension weight is adjusted to be approximately equal to the weight of the car in which half of the capacity is loaded. Thus, if the elevator car is not half the capacity, the car and the counterweight will be unbalanced. Therefore, when stopping the elevators on which the passengers are not occupying each floor and stopping the driving force of the motor, the elevators are kept stationary so that the elevators do not self-run due to the unbalanced weight of the car and the counterweight. A brake device is incorporated.

  This brake device has a mechanism that presses a brake shoe against a movable part (rotating drum) with a biasing force of a spring and brakes with a frictional force when the power is not turned on. And when starting the electric motor of a braking (brake) state with this brake device, a brake release signal is sent to a brake device, a spring is opened with the magnetic force of an electromagnet, for example, and a brake shoe is moved from a movable part (rotating drum). Release. Therefore, in a state where the elevator system is not operating, the brake device maintains a braking (braking) state with respect to the electric motor.

  Further, in addition to the above-described normal driving state, some abnormality is detected in the elevator, and the braking force by the brake device is also used for emergency braking of the elevator when the elevator is urgently stopped.

  If the brake device installed in the elevator breaks down and the brake shoe is separated from the movable part (rotating drum) even when the power is cut off, a brake signal is sent to the brake device when the car stops on each floor However, if the car and the counterweight are not suspended, the car will run in a dangerous state.

  Alternatively, when the brake device is malfunctioning, if an abnormality is detected in the elevator and an emergency stop occurs, the braking force for suddenly decelerating the elevator has no effect or has been reduced. The car cannot be decelerated and cannot stop before the end of the hoistway, resulting in a dangerous situation.

  In order to avoid a dangerous state caused by the occurrence of a failure of the brake device described above, Patent Document 1 proposes a technology that uses both the brake device and regenerative braking during an emergency stop. FIG. 12 is a schematic configuration diagram of the elevator control device shown in Patent Document 1 in which a regenerative braking function is incorporated.

  The three-phase alternating current supplied from the alternating current power source 1 is full-wave rectified to direct current by the rectifier 3 of the power converter 2, and the ripple is absorbed by the smoothing capacitor 4 and supplied to the inverter 5. In this inverter 5, six parallel circuits 8 of diodes 6 and switching elements 7 are bridge-connected. Then, each switching element 7 of the inverter 5 is controlled to be energized and cut off at high speed by each PWM (pulse width modulation) signal from an operation control unit (not shown), whereby the input direct current has three frequencies and arbitrary voltages. It is converted into phase alternating current and supplied to the electric motor 11 via the contactor contact 9 and the power line 10.

  A load resistor 13 for energy consumption of regenerative power is connected between the power lines 10 via contactor contacts 12.

  In such an elevator control apparatus, in a normal state, the contactor contact 9 is closed and the contactor contact 12 is opened. Therefore, the electric motor 11 is driven by the three-phase alternating current supplied from the inverter 5.

  When stopping the motor 11, a brake device (not shown) is operated, all PWM signals for each switching element 7 of the inverter 5 are turned off, the DC / AC conversion operation of the inverter 5 is stopped, and the contactor contact 9 is opened and the contactor contact 12 is closed. Therefore, the energy of the regenerative power generated in the electric motor 11 is consumed by the load resistor 13, so that the braking force is applied to the electric motor 11 and the electric motor 11 is stopped in a short time.

Note that this regenerative braking function can establish a field magnetic flux independently without supplying power to the power winding, or a permanent magnet synchronous motor or a separately excited DC motor in which the field magnetic flux is always established. It is effective for linear motors.
Japanese Patent No. 2526732

  However, the elevator controller having the regenerative braking function shown in FIG. 12 still has the following problems.

  That is, as shown in FIG. 12, the load resistor 13 that consumes the energy of the regenerative power generated in the electric motor 11, the contactor contact 12 that disconnects each load resistor 13 from the power line 10 when normal, the electric motor 11 and the load resistor 13 during braking A contactor contact 9 is required to be disconnected from the inverter 5.

  As a result, the manufacturing cost of the entire elevator control device increases, and the elevator control device increases in size.

  The present invention has been made in view of such circumstances, and without incorporating large circuit components such as load resistors and contactor contacts, without significantly increasing manufacturing costs, and suppressing the enlargement of the apparatus. An object of the present invention is to provide an elevator control device that can realize a regenerative braking function in a state.

  In order to solve the above problems, the present invention provides a permanent magnet synchronous motor that moves an elevator car up and down, converts alternating current supplied from an alternating current power source into direct current by a rectifier, and converts the direct current into a diode and a switching element. A power conversion unit that converts AC to AC by an inverter formed by bridge connection of parallel circuits and supplies it to the field windings of a permanent magnet synchronous motor, and the switching elements of the inverter are cut off according to the operation of the elevator The operation control unit to be controlled, according to the operation operation of the elevator, each switching element on the positive electrode side and each switching element on the negative electrode side of the inverter is maintained in the closed state, and the other pole side And a regenerative braking control unit that regeneratively brakes the electric motor by maintaining each of the switching elements in an open state.

  In the elevator control device configured as described above, the operation control unit, for example, when a car call button operation in the car or a hall call button operation on each floor is performed by an elevator user, each switching element of the inverter is set. Drive control of the permanent magnet synchronous motor is performed by performing energization cutoff control at high speed. In this case, to stop the electric motor, the AC supplied from the inverter to the electric motor is interrupted. In this state, an electromotive force is excited by the rotating permanent magnet in the field winding of the permanent magnet synchronous motor.

  In the braking period for the motor, each switching element on one of the poles of the inverter is in a closed state, so that a closed circuit is formed by the field winding and the switching element of the inverter. Therefore, the energy of the regenerative power generated by the electromotive force generated in the field winding is consumed in the field winding while the current of the regenerative power flows through the closed circuit. A braking force is applied to the motor, and the motor is stopped in a short time.

  In this way, the rotational energy of the motor that continues after the AC power is cut off is converted into regenerative power energy and then consumed by the field winding of the motor. Therefore, it is not necessary to provide a separate dedicated load resistor in order to consume regenerative power energy. Further, it is not necessary to provide a contactor contact for separating the load resistance from the power line in the normal state.

  Another invention is a permanent magnet synchronous motor that moves an elevator car up and down, and an alternating current supplied from an alternating current power source is converted into a direct current by a rectifier and this direct current is bridge-connected with a parallel circuit of a diode and a switching element. An inverter that converts the current into AC and supplies it to the field windings of the permanent magnet synchronous motor, a brake device that mechanically brakes the movement of the car, and an inverter according to the operation of the elevator An operation control unit for controlling energization cutoff of each switching element and controlling the brake device, and either one of each switching element on the positive electrode side and each switching element on the negative electrode side during the braking period of the brake device The motor is regenerated by maintaining each switching element in a closed state and each switching element on the other pole side in an open state. And a regenerative braking control unit for moving.

  In the elevator control device configured as described above, a brake device for mechanically braking the movement of the car is provided. A closed circuit is formed by the above-described field winding and the switching element of the inverter during the braking period of the brake device. Therefore, similarly to the above-described invention, the energy of the regenerative power due to the electromotive force generated in the field winding is consumed in the field winding while the current of the regenerative power flows through the closed circuit. A braking force is applied to the electric motor, and the electric motor is stopped in a short time.

  In another aspect of the invention, the regenerative braking control unit in the elevator control device according to the above-described invention has an operation state detection unit that detects an operation state of the brake device, and the operation state detection unit is operated during the braking period of the brake device. The electric motor is regeneratively braked only when the braking impossible state is detected.

  In the elevator control device configured as described above, when the brake device fails and the motor cannot be braked, the motor is regeneratively braked by the above-described method.

  In another invention, the operation control unit in the elevator control device of the invention described above has a current detection unit that detects a current flowing in the field winding of the motor during the regenerative braking period. Furthermore, the regenerative braking control unit stops the regenerative braking when the current detected by the current detection unit exceeds the upper limit value.

  In another aspect of the invention, the operation control unit in the elevator control device of the invention described above has a speed detection unit that detects the speed of the motor during the regenerative braking period. Furthermore, the regenerative braking control unit stops the regenerative braking when the deceleration obtained from the speed detected by the speed detection unit exceeds the upper limit value.

  According to another aspect of the invention, in the elevator control device according to the above-described invention, a power failure detection unit that detects a power failure of the AC power supply and a driving power supply to the regenerative braking control unit during a period when the power failure detection unit detects a power failure. Battery.

  That is, since the field winding has a smaller impedance than the dedicated load resistance, an excessive current flows and a large braking force is obtained. However, it has a function to stop regenerative braking when the current exceeds the range of current that the switching elements and field windings of the inverter can withstand or when excessive braking exceeding the upper limit is recognized. . Furthermore, the regenerative braking function is compensated when the AC power supply is interrupted by a battery.

  Another invention is another excitation type DC motor in which direct current is supplied from a direct current power source to a separately excited field winding that moves the elevator car up and down, and alternating current supplied from the alternating current power source is converted into direct current by a rectifier. A power converter that converts direct current into alternating current by an inverter formed by bridge-connecting a parallel circuit of a diode and a switching element and supplies the alternating current to the armature winding of another excitation type DC motor, and an inverter according to the operation of the elevator An operation control unit that controls energization of each of the switching elements, and each switching element on one of the positive side switching element and the negative side switching element of the inverter are closed according to the operation of the elevator. A regenerative braking control unit that regeneratively brakes the other excitation type DC motor by maintaining each switching element on the other pole side in an open state. Eteiru.

  In another invention, another excitation type DC motor in which DC is supplied from a DC power source to a separately excited field winding that moves the elevator car up and down, and AC supplied from the AC power source is converted to DC by a rectifier. Converts direct current into alternating current with an inverter formed by bridge-connecting a parallel circuit of a diode and a switching element and supplies it to the armature winding of another excitation type DC motor, and mechanically brakes the movement of the car A brake device that performs energization cut-off control of each switching element of the inverter according to an operation operation of the elevator and controls the brake device, and each switching element on the positive side of the inverter during the braking period of the brake device, Each switching element on one pole side with each switching element on the negative electrode side is kept closed, and each switching element on the other pole side is opened. And a regenerative braking control unit for regenerative braking other-excited DC motor by maintaining the state.

  As described above, the regenerative braking for the electric motor according to the present invention is performed by moving the elevator car up and down with the other excitation type DC motor in which DC is supplied from the DC power source to the separately excited field winding and AC is supplied to the armature winding. It can be applied to an elevator control device.

  In another invention, the linear motor is composed of a fixed-side winding arranged in the vertical direction in the elevator hoistway and a permanent magnet attached to a car moving up and down in the hoistway, and supplied from an AC power source. A power conversion unit that converts alternating current into direct current with a rectifier, converts this direct current into alternating current with an inverter formed by bridge-connecting a parallel circuit of a diode and a switching element, and supplies the alternating current to the fixed side winding of the linear motor; An operation control unit that performs energization cutoff control of each switching element of the inverter according to the driving operation, and either one of the switching element on the positive electrode side and each switching element on the negative electrode side according to the driving operation of the elevator The linear motor is maintained by maintaining each switching element in a closed state and each switching element on the other pole side in an open state. And a regenerative braking control unit for raw braking.

  As described above, the regenerative braking for the electric motor according to the present invention is performed by using a linear motor comprising a fixed-side winding arranged in the vertical direction in the elevator hoistway and a car moving vertically in the hoistway and a permanent magnet. It can be applied to an elevator control device that moves up and down.

  According to the present invention, a large circuit component such as a load resistor or a contactor contact is not incorporated, a manufacturing cost is not significantly increased, a manufacturing cost is not significantly increased, and an increase in size of the apparatus is suppressed. Thus, the regenerative braking function can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of an elevator control apparatus according to the first embodiment of the present invention. The same parts as those of the conventional elevator control device shown in FIG. 12 are denoted by the same reference numerals, and detailed description of the overlapping parts is omitted.

The three-phase alternating current supplied from the alternating current power supply 1 via the power line 14 is full-wave rectified to direct current by the rectifier 3 of the power conversion unit 2, and the ripple component is absorbed by the smoothing capacitor 4 and supplied to the inverter 5. In this inverter 5, six parallel circuits 8 of diodes 6 and switching elements 7 are bridge-connected. The switching elements 7 of the inverter 5 are _driven at high speed by the PWM signals g _{R +} , g _R−, g _{S +} , g _S− , g _{T +} , g _T− output from the PWM (pulse width modulation) signal generator 15. By controlling the energization interruption, the direct current input from the rectifier 3 is converted into a three-phase alternating current having an arbitrary frequency and voltage and supplied to the permanent magnet synchronous motor 16 via the power line 10.

  The electric motor 16 controls the rotation of the main sheave 17. A rope 20 having both ends fixed to a ceiling 21 of a hoistway is hung on the main sheave 17 and the two sub sheaves 18, 19, and a car 22 and a counterweight 23 are attached to each sub sheave 18, 19.

  A car call button 24 is provided in the car 22, and a hall call button 25 is provided in the elevator hall on each floor. The car call and the hall call inputted by the car call button 24 operation and the hall call button 25 operation are inputted to the elevator start / stop unit 26.

  A speedometer 27 is attached to the permanent magnet synchronous motor 16, and the detected speed v is input to the speed controller 28 and the current controller 29.

  Further, a brake device 30 is attached to the permanent magnet synchronous motor 16. As described above, the brake device 30 has a mechanism that presses the brake shoe against the movable part (rotating drum of the electric motor 16) with the biasing force of the spring and brakes with the frictional force when the power is not turned on. .

  And when starting the electric motor 16 in a braking (brake) state with this brake device 30, a brake release signal c is sent from the elevator start / stop unit 26 to the brake device 30 and, for example, a spring is opened by the magnetic force of an electromagnet, The brake shoe is moved away from the movable part (the rotating drum of the electric motor 16). Therefore, the brake device 30 maintains a braking (brake) state with respect to the electric motor 16 in a state where the elevator system is not operating. Further, a failure detection signal d indicating whether or not the brake device 30 is operating normally is input to the regenerative braking command unit 31.

  FIG. 2A is a schematic cross-sectional view of the permanent magnet synchronous motor 16. A plurality of field windings 32R, 32S, and 32T are fixed to the stator side, and a plurality of permanent magnets 33 are attached to the rotor side. The field windings 32R, 32S, 32T connected to the external power lines 10 of the phases R, S, T are, for example, star-connected as shown in FIG. 2B or Δ-connected as shown in FIG. Has been.

  In FIG. 1, the current I of the power line 10 is detected by an ammeter 34 and input to a current control unit 29 and an overcurrent detection unit 35.

The winding short-circuit command unit 36 is connected to the PWM signal generation unit 15 in a state where the changeover switch 37 is connected to the winding short-circuit command unit 36 side by the short-circuit signal a output from the regenerative braking command unit 31. As shown, a voltage instruction is sent to maintain the three switching elements 7 on the positive side of the inverter 5 in the open state (OFF) and to maintain the three switching elements 7 on the negative side in the closed state (ON). . Then, the levels of the PWM signals g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} , g _T− applied from the PWM signal generator 15 to the switching elements 7 of the R, S, T phases are as follows. become that way.

g _{R +} = OFF, g _R- = ON, g _{S +} = OFF,
g _S- = ON, g _{T +} = OFF, g _T- = ON
It becomes.

  Therefore, in the braking period for the motor 16, a closed circuit is formed by the three switching elements 7 closed on the negative electrode side of the inverter 5, the power line 10, and the field windings 32R, 32S, 32T of the motor 16. To do. Accordingly, the regenerative power energy generated by the electromotive force generated in the field windings 32R, 32S, and 32T is consumed in each field winding 32R, 32S, and 32T in the process in which the current of the regenerative power flows through the closed circuit. . Therefore, a braking force is applied to the electric motor 16, and the electric motor 16 is stopped in a short time.

In a state where the changeover switch 38 is connected to the current control unit 29 side and the changeover switch 37 is connected to the current control unit 29 side by the brake release signal c from the elevator start / stop unit 26, the current control unit 29 A three-phase voltage command is output to the PWM signal generator 15 based on the torque current command from the speed controller 28. The PWM signal generation unit 15 sends PWM signals g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} , and g _T− to the respective switching elements 7 of the inverter 5.

The operation control unit includes an overcurrent detection unit 35, a PWM signal generation unit 15, a regenerative braking command unit 31, a winding short-circuit command unit 36, a current control unit 29, a speed control unit 28, an elevator start / stop unit 26, and an ammeter. 34 and a speedometer 27. Further, the regenerative braking control unit includes an overcurrent detection unit 35, a regenerative braking command unit 31, and a winding short-circuit command unit 36.

  The operation of each unit in the operation control unit of the elevator control apparatus having such a configuration will be described in order. When the car call button 24 operation, the hall call button 25 operation car call and the hall call are input, the elevator start / stop unit 26 transmits a brake release signal c to the brake device 30, the regenerative braking command unit 31, and the changeover switch 38. Then, the brake (brake) state of the brake device 30 with respect to the electric motor 16 is released. Further, the elevator start / stop unit 26 starts the speed control unit 28. The regenerative braking control unit 31 that has received the brake release signal c turns off the short circuit signal a and connects the changeover switch 37 to the current control unit 29 side.

  The speed control unit 28 adjusts the current control unit 29 so that the speed v of the motor 16 measured by the speedometer 27 becomes a series of traveling speeds v of acceleration, constant speed, and deceleration from the departure floor to the arrival floor in the elevator operation. In response to this, a torque current command of the electric motor 16 is output.

The current control unit 29 outputs a three-phase voltage command to the PWM signal generation unit 15 so that the current I detected by the ammeter 34 becomes a current corresponding to the torque current command. The PWM signal generator 15 outputs PWM signals g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} to the switching elements 7 of the inverter 5 so that a voltage corresponding to a voltage command is output to the motor 16. , G _T- .

  When the car 22 reaches the vicinity of the destination floor, the elevator start / stop unit 26 sends a brake signal b to the brake device 30 and the regenerative braking command unit 31 to place the brake device 30 in a braking (braking) state with respect to the electric motor 16. Further, the selector switch 37 is switched to the “0” signal side.

  And the regenerative braking control part comprised by the overcurrent detection part 35, the regenerative braking instruction | command part 31, and the winding short circuit instruction | command part 36 implements the regenerative braking with respect to the electric motor 16 according to the flowchart shown in FIG.

For example, when a minute time Δt such as 0.5 seconds elapses (step S1), when the brake signal b is not output to the brake device 30 (S2), the short circuit signal a to the changeover switch 37 is turned off (S3). ), The overcurrent flag is cleared to 0 (S4). In S2, when the brake signal b is output to the brake device 30, when the failure detection signal d is input to the regenerative braking command unit 31 (S5), the short circuit signal a is currently being output (ie, not in regenerative braking) (S6), further, when the current I detected by the ammeter 34 in the overcurrent detection unit 35 is less than the upper limit value I _H indicating the overcurrent (S7), without performing the regenerative braking The overcurrent flag is set to 1 (S8).

If current I is less than the upper limit value I _H indicating the overcurrent (S7), turns on the short-circuit signals a, to implement the regenerative braking, it switches the change-over switch 37 to the shorted turn command unit 36 side (S9 ). As a result, regenerative braking for the electric motor 16 is started.

Also, currently in short signal a output (i.e. in regenerative braking) (S6), if the detected current I by the ammeter 34 is not less than the upper limit value I _H indicating the overcurrent (S10), overcurrent The flag is set to 1 (S11), the short circuit signal a is turned off, and regenerative braking is stopped (S12).

Currently in short signal a output (i.e. in regenerative braking) (S6), the detection of current I by the current meter 34 in the case of less than the reference value I _L to cancel to zero (S13), overcurrent flag ( S14).

When the current I detected by the ammeter 34 is less than the upper limit value I _{H and} greater than or equal to the reference value I _L (S13), and the overcurrent flag is 1 (S15), the short-circuit signal a is turned off and regeneration is performed. The braking is interrupted (S16). If the overcurrent flag is 0, nothing is done.

  FIG. 5A is a diagram showing the relationship between the time t from the start of regenerative braking to the stop of the motor 16 and the current I (regenerative current) for the motor 16 rotating at a constant speed. FIG. 5 (b9) is a diagram showing the relationship between the time t from the start of regenerative braking to the stop of the motor 16 and the speed v for the motor 16 rotating at a constant speed.

  In the elevator control apparatus of the first embodiment configured as described above, a regenerative braking function is employed as one of means for braking the permanent magnet synchronous motor 16. The energy of regenerative power generated in the field windings 32R, 32S, 32T of the permanent magnet synchronous motor 16 is formed by the field windings 32R, 32S, 32T and the switching elements 7 of the inverter 5. The field windings 32R, 32S, and 32T in the closed circuit are consumed. Therefore, a braking force is applied to the electric motor 16, and the electric motor 16 is stopped in a short time.

  Therefore, it is not necessary to provide a separate dedicated load resistor in order to consume regenerative power energy. Further, it is not necessary to provide a contactor contact for separating the load resistance from the power line in the normal state.

Further, as shown in FIG. 5A, when the current I flowing in the field windings 32R, 32S, 32T of the electric motor 16 and each switching element 7 of the inverter 5 exceeds the upper limit value I _H during the regenerative braking period. the regenerative braking pauses, when the current I falls below the reference value I _L, running again, the regenerative braking. Therefore, it is possible to prevent the field windings 32R, 32S, and 32T from being damaged by the excessive current flowing through the field windings 32R, 32S, and 32T and the switching elements 7 in advance.

  The present invention is not limited to the first embodiment described above. In the first embodiment, regenerative braking is activated only in an emergency when the regular brake device 30 breaks down. However, the regular brake device 30 and regenerative braking can be used in combination.

(Second Embodiment)
FIG. 6 is a schematic configuration diagram of an elevator control apparatus according to the second embodiment of the present invention. The same parts as those of the elevator control apparatus according to the first embodiment of the present invention shown in FIG. 1 are denoted by the same reference numerals, and detailed description of the overlapping parts is omitted.

  In the elevator control apparatus according to the second embodiment, a speedometer 27 is attached to the permanent magnet synchronous motor 16, and the speed v detected by the speedometer 27 includes a speed control unit 28, a current control unit 29, And input to the deceleration detection unit 39.

  The deceleration detection unit 39 calculates the deceleration dv by time differentiation of the input speed v. Note that the overcurrent detection unit 35 in the first embodiment is removed. Therefore, the current I of the power line 10 is detected by the ammeter 34 and input only to the current control unit 29.

  The regenerative braking control unit includes a deceleration detection unit 39, a regenerative braking command unit 31, and a winding short-circuit command unit 36. Other configurations are the same as those of the first embodiment shown in FIG.

  And the regenerative braking control part comprised by the overcurrent detection part 35, the regenerative braking instruction | command part 31, and the winding short circuit instruction | command part 36 implements the regenerative braking with respect to the electric motor 16 according to the flowchart shown in FIG.

  For example, when a minute time Δt such as 0.5 seconds elapses (step Q1), when the brake signal b is not output to the brake device 30 (Q2), the short circuit signal a to the changeover switch 37 is turned off (Q3). ), Clear the over-deceleration flag to 0 (Q4). When the brake signal b is output to the brake device 30 at Q2, when the failure detection signal d is input to the regenerative braking command unit 31 (Q5), the short circuit signal a is currently being output (ie, It is checked whether regenerative braking is in progress (Q6).

If the short circuit signal a is not being output (Q6), the deceleration dv of the speed v of the motor 16 calculated by the deceleration detection unit 39 is an upper limit value dv _H that gives anxiety to the passengers who are on the car 22. In the above case (Q7), the regenerative braking is not performed and the over-deceleration flag is set to 1 (Q8). When the deceleration dv is less than the upper limit value dv _H indicating over-deceleration (Q7), the short-circuit signal a is turned ON and the changeover switch 37 is switched to the short-circuit winding command section 36 side in order to perform regenerative braking ( Q9). As a result, regenerative braking for the electric motor 16 is started.

Also, now, short-circuit signal a is in the output (i.e. in regenerative braking) and (Q6), if the detected deceleration dv by the deceleration detecting portion 39 is equal to or higher than the upper limit dv _H indicating excessive deceleration (Q10) Then, the overspeed flag is set to 1 (Q11), the short circuit signal a is turned OFF, and the regenerative braking is stopped (Q12).

If the short-circuit signal a is currently being output (ie during regenerative braking) (Q6) and the deceleration dv detected by the deceleration detector 39 is less than the reference value dv _L (Q13), the over-deceleration flag is set to 0. (Q14).

When the deceleration dv detected by the deceleration meter 39 is less than the upper limit value dv _{H and} greater than or equal to the reference value dv _L (Q13), when the overspeed deceleration flag is 1 (Q15), the short circuit signal a is turned OFF. Then, regenerative braking is interrupted (Q16). If the overcurrent flag is 0, nothing is done.

  FIG. 8A is a diagram showing the relationship between the time t from the start of regenerative braking to the stop of the motor 16 and the deceleration dv with respect to the motor 16 rotating at a constant speed v. FIG. 8B is a diagram showing the relationship between the speed t and the time t from the start of regenerative braking to the stop of the electric motor 16 with respect to the electric motor 16 rotating at a constant speed v.

  Also in the elevator control apparatus of the second embodiment configured as described above, the regenerative braking function is adopted as one of the means for braking the permanent magnet synchronous motor 16, so the first embodiment described above. It is possible to achieve substantially the same function and effect as those of the elevator control apparatus.

Furthermore, in the elevator control apparatus of the second embodiment, as shown in FIG. 8A, the deceleration dv of the electric motor 16 is uneasy for the passengers who are on the car 22 during the regenerative braking period. If the upper limit value dv _H to give, when the regenerative braking pause, deceleration dv drops below the reference value dv _L, running the regenerative braking again. Therefore, the car 22 can be braked and stopped on the destination floor in a short time without causing anxiety to the passengers on the car 22.

(Third embodiment)
FIG. 9 is a schematic configuration diagram of an elevator control apparatus according to the third embodiment of the present invention. The same parts as those of the elevator control apparatus according to the first embodiment of the present invention shown in FIG. 1 are denoted by the same reference numerals, and detailed description of the overlapping parts is omitted.

In the elevator control apparatus of the third embodiment, a power failure detection unit 40 that detects a power failure of the AC power source 1 is provided on the power line 14 for supplying three-phase alternating current from the AC power source 1 to the power conversion unit 2. . Further, in the event of a power failure, each PWM signal g _{R +} , g _R− , g _{S +} , g _S− having the following signal levels for realizing regenerative braking for the motor 16 for each switching element 7 of the inverter 5. , G _{T +} , and g _T− are output, a power failure winding short-circuit command unit 43 is provided.

g _{R +} = OFF, g _R- = ON, g _{S +} = OFF,
g _S- = ON, g _{T +} = OFF, g _T- = ON
The operation of the winding short-circuit command unit 43 during a power failure is guaranteed by the battery 44 even during a power failure of the AC power supply 1.

Furthermore, the changeover switches 41 and 42 are connected to the signal paths of the PWM signals g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} , and g _{T− to} the switching elements 7 of the inverter 5 from the PWM signal generator 15. It is inserted. The PWM signals g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} , and g _T− from the winding short-circuit command unit 43 at the time of power failure are input to the other ends of the changeover switches 41 and 42.

  In the normal state, each PWM signal from the PWM signal generator 15 is applied to each switching element 7 of the inverter 5 via the changeover switches 41 and 42. However, when a power failure occurs, the power failure detection unit 40 switches the selector switches 41 and 42 to the power failure coil short-circuit command unit 43 side. , 42 to each switching element 7 of the inverter 5.

  Therefore, even if a power failure occurs, the car 22 can be braked to the destination floor in a short time using regenerative braking.

  The regenerative braking command unit 31a of the third embodiment outputs a short circuit signal a when the brake device 30 does not operate normally even though the brake signal b is output to the brake device 30. Start regenerative braking.

(Fourth embodiment)
FIG. 10 is a schematic view showing a main part of an elevator control apparatus according to the fourth embodiment of the present invention. The same parts as those of the elevator control apparatus according to the first embodiment of the present invention shown in FIG. 1 are denoted by the same reference numerals, and detailed description of the overlapping parts is omitted.

In the elevator control device of the fourth embodiment, the three-phase alternating current supplied from the alternating current power source 1 via the power line 14 is full-wave rectified to direct current by the rectifier 3 of the power conversion unit 2, and the ripple amount is reduced by the smoothing capacitor 4. Absorbed and supplied to the inverter 5a. In this inverter 5a, four parallel circuits 8 of diodes 6 and switching elements 7 are bridge-connected. Then, each switching element 7 of the inverter 5a is controlled to be cut off at high speed by each PWM signal g _{R +} , g _R− , g _{S +} , g _S− output from a PWM (pulse width modulation) signal generator (not shown). Thus, the input direct current is converted into a single-phase alternating current having an arbitrary frequency and voltage, and supplied to the armature winding 46 of the other excitation type direct current motor 45 through the power line 10a.

  The other excitation field winding 47 is supplied with direct current from the uninterruptible power supply 49 via the resistor 48. The uninterruptible power supply 49 is supplied with a direct current obtained by rectifying a three-phase alternating current from an alternating current power supply 50 by a rectifier 51. Therefore, even if a power failure occurs in the AC power supply 50, the DC magnetic field applied to the armature winding 46 by the separately excited field winding 47 is maintained until the other excitation type DC motor 45 stops. Yes.

  The operation control unit and the regenerative braking control unit are substantially the same as the operation control unit and the regenerative braking control unit of the first embodiment shown in FIG.

Also in the elevator control apparatus of the fourth embodiment configured as described above, when stopping the other excitation type DC motor 45, the PWM signal generator (not shown) switches the switching elements 7 of the R and S phases of the inverter 5a. The level of each PWM signal g _{R +} , g _R− , g _{S +} , g _S− to be applied is set as follows.

g _{R +} = OFF, g _R- = ON, g _{S +} = OFF, g _S- = ON
Therefore, in the braking period for the other excitation type DC motor 45, the two switching elements 7 closed on the negative electrode side of the inverter 5a, the power line 10a, and the armature winding 46 of the other excitation type DC motor 45 are used. Form a closed circuit. Therefore, the regenerative power energy generated by the electromotive force generated in the armature winding 46 is consumed in the armature winding 46 in the process in which the current of the regenerative power flows through the closed circuit. Therefore, a braking force is applied to the other excitation type DC motor 45, and the other excitation type DC motor 45 is stopped in a short time.

  Therefore, substantially the same operation effect as the elevator control device of the first embodiment shown in FIG. 1 can be obtained.

(Fifth embodiment)
FIG. 11 is a schematic view showing a main part of an elevator control apparatus according to the fifth embodiment of the present invention. The same parts as those of the elevator control apparatus according to the first embodiment of the present invention shown in FIG. 1 are denoted by the same reference numerals, and detailed description of the overlapping parts is omitted.

In the elevator control apparatus of the fifth embodiment, the three-phase alternating current supplied from the alternating current power supply 1 via the power line 14 is full-wave rectified to direct current by the rectifier 3 of the power conversion unit 2, and the ripple amount is reduced by the smoothing capacitor 4. It is absorbed and supplied to the inverter 5. In this inverter 5, six parallel circuits 8 of diodes 6 and switching elements 7 are bridge-connected. Then, the PWM signals g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} , g _T− output from the PWM (pulse width modulation) signal generator 15 (not shown) are connected to the switching elements 7 of the inverter 5 _. In this way, the input direct current is converted into a three-phase alternating current having an arbitrary frequency and voltage and supplied to the linear motor 52 via the power line 10.

  The linear motor 52 includes a plurality of fixed-side windings 54 arranged in the vertical direction in the elevator hoistway 53 and permanent magnets 55 attached to the side surface of the car 22a that moves up and down in the hoistway 53. Yes. And the three-phase alternating current output from the inverter 5 is supplied.

  The operation control unit and the regenerative braking control unit are substantially the same as the operation control unit and the regenerative braking control unit of the first embodiment shown in FIG.

Also in the elevator control apparatus of the fifth embodiment configured as described above, when the linear motor 52 is stopped, it is applied to the switching elements 7 of the R, S, and T phases of the inverter 5 from a PWM signal generator (not shown). The level of each PWM signal g _{R +} , g _R− , g _{S +} , g _S− , g _{T +} , g _T− is set as follows.

g _{R +} = OFF, g _R- = ON, g _{S +} = OFF,
g _S- = ON, g _{T +} = OFF, g _T- = ON
Therefore, during the braking period for the linear motor 52, the closed three switching elements 7 on the negative electrode side of the inverter 5, the power line 10, and the fixed windings 54 of the linear motor 52 form a closed circuit. . Therefore, the energy of the regenerative power due to the electromotive force generated in each fixed side winding 54 is consumed in the fixed side winding 54 in the process in which the current of the regenerative power flows through the closed circuit. Therefore, a braking force is applied to the linear motor 52, and the linear motor 52 is stopped in a short time.

  Therefore, substantially the same operation effect as the elevator control device of the first embodiment shown in FIG. 1 can be obtained.

1 is a schematic configuration diagram of an elevator control device according to a first embodiment of the present invention. The figure which shows the cross section and circuit of an electric motor integrated in the elevator control apparatus of the embodiment The figure for demonstrating control with respect to the inverter integrated in the elevator control apparatus of the embodiment Flow chart showing the operation of the elevator control device of the same embodiment The figure which shows the regenerative current characteristic and speed characteristic of the electric motor of the elevator control apparatus of the embodiment The schematic block diagram of the elevator control apparatus concerning 2nd Embodiment of this invention. Flow chart showing the operation of the elevator control device of the same embodiment The figure which shows the deceleration characteristic and speed characteristic of the electric motor of the elevator control apparatus of the embodiment The schematic block diagram of the elevator control apparatus concerning 3rd Embodiment of this invention. The schematic diagram which takes out and shows the principal part of the elevator control apparatus concerning 4th Embodiment of this invention. The schematic diagram which takes out and shows the principal part of the elevator control apparatus concerning 5th Embodiment of this invention. Schematic configuration diagram of a conventional elevator control device

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... AC power supply, 2 ... Power conversion part, 4 ... Rectifier, 5.5a ... Inverter, 6 ... Diode, 7 ... Switching element, 8 ... Parallel circuit, 10, 10a, 14 ... Power line, 15 ... PWM signal generation part, DESCRIPTION OF SYMBOLS 16 ... Electric motor, 22 and 22a ... Car, 26 ... Elevator starting / stopping part, 27 ... Speedometer, 28 ... Speed control part, 29 ... Current control part, 30 ... Brake apparatus, 31 ... Regenerative braking command part, 32R, 32S, 32R: Field winding, 33, 55: Permanent magnet, 34: Ammeter, 35: Overcurrent detection unit, 36: Winding short-circuit command unit, 39: Deceleration detection unit, 40 ... Power failure detection unit, 43 ... Power failure Winding short-circuit command section, 44 ... battery, 45 ... other excitation DC motor, 46 ... armature winding, 47 ... other excitation field winding, 49 ... uninterruptible device, 52 ... linear motor, 53 ... hoistway, 54 ... Fixed winding

Claims (9)

A permanent magnet synchronous motor that moves the elevator car up and down;
The alternating current supplied from the alternating current power source is converted into direct current by a rectifier, and this direct current is converted into alternating current by an inverter in which a parallel circuit of a diode and a switching element is bridge-connected, so that the field winding of the permanent magnet synchronous motor is performed. A power converter for supplying the wire;
An operation control unit that performs energization cutoff control of each switching element of the inverter according to the operation of the elevator;
According to the operation of the elevator, each switching element on the one pole side of each switching element on the positive electrode side and each switching element on the negative electrode side of the inverter is kept closed, and each switching element on the other pole side is A regenerative braking control unit that regeneratively brakes the electric motor by maintaining an open state;
An elevator control device comprising: A permanent magnet synchronous motor that moves the elevator car up and down;
The alternating current supplied from the alternating current power source is converted into direct current by a rectifier, and this direct current is converted into alternating current by an inverter in which a parallel circuit of a diode and a switching element is bridge-connected, so that the field winding of the permanent magnet synchronous motor is performed. A power converter for supplying the wire;
A brake device that mechanically brakes the movement of the car, an operation control unit that controls energization cutoff of each switching element of the inverter according to an operation operation of the elevator, and controls the brake device;
During the braking period of the brake device, each switching element on one pole side of each switching element on the positive electrode side and each switching element on the negative electrode side of the inverter is maintained in a closed state, and each switching element on the other pole side is maintained. A regenerative braking control unit for regeneratively braking the electric motor by maintaining the element in an open state;
An elevator control device comprising:   The regenerative braking control unit has an operation state detection unit that detects an operation state of the brake device, and only when the operation state detection unit detects a brake disabled state of the brake device during a braking period of the brake device. The elevator control device according to claim 2, wherein the electric motor is regeneratively braked. The operation control unit has a current detection unit that detects a current flowing in a field winding of the electric motor during the regenerative braking period,
The elevator control apparatus according to claim 2 or 3, wherein the regenerative braking control unit stops the regenerative braking when the current detected by the current detection unit exceeds an upper limit value. The operation control unit includes a speed detection unit that detects a speed of the electric motor during the regenerative braking period,
The elevator control device according to claim 2 or 3, wherein the regenerative braking control unit stops the regenerative braking when a deceleration obtained from the speed detected by the speed detection unit exceeds an upper limit value. A power failure detection unit for detecting a power failure of the AC power supply;
The elevator control device according to any one of claims 1 to 5, further comprising a battery that supplies driving power to the regenerative braking control unit during a period in which the power failure detection unit detects a power failure. . Another excitation type DC motor in which direct current is supplied from a direct current power source to the other excitation field winding for moving the elevator car up and down;
The alternating current supplied from the alternating current power source is converted into direct current by a rectifier, and this direct current is converted into alternating current by an inverter formed by bridge-connecting a parallel circuit of a diode and a switching element. A power converter to be supplied to
An operation control unit that performs energization cutoff control of each switching element of the inverter according to the operation of the elevator;
Depending on the driving operation of the elevator, each switching element on the one pole side of each switching element on the positive electrode side and each switching element on the negative electrode side of the inverter is kept closed, and each switching element on the other pole side is A regenerative braking control unit that regeneratively brakes the other excitation type DC motor by maintaining the open state;
An elevator control device comprising: Another excitation type DC motor in which direct current is supplied from a direct current power source to the other excitation field winding for moving the elevator car up and down;
The alternating current supplied from the alternating current power source is converted into direct current by a rectifier, and this direct current is converted into alternating current by an inverter formed by bridge-connecting a parallel circuit of a diode and a switching element. A power converter to be supplied to
A brake device that mechanically brakes the movement of the car, an operation control unit that controls energization cutoff of each switching element of the inverter according to an operation operation of the elevator, and controls the brake device;
During the braking period of the brake device, each switching element on one pole side of each switching element on the positive electrode side and each switching element on the negative electrode side of the inverter is maintained in a closed state, and each switching element on the other pole side is maintained. A regenerative braking control unit for regeneratively braking the other excitation type DC motor by maintaining the element in an open state;
An elevator control device comprising: A linear motor comprising a fixed-side winding arranged in the vertical direction in the elevator hoistway and a permanent magnet attached to a car that moves up and down in the hoistway;
The alternating current supplied from the alternating current power source is converted into direct current by a rectifier, and this direct current is converted into alternating current by an inverter formed by bridge-connecting a parallel circuit of a diode and a switching element and supplied to the fixed side winding of the linear motor. A power converter,
An operation control unit that performs energization cutoff control of each switching element of the inverter according to the operation of the elevator;
According to the operation of the elevator, each switching element on the one pole side of each switching element on the positive electrode side and each switching element on the negative electrode side of the inverter is kept closed, and each switching element on the other pole side is A regenerative braking control unit that regeneratively brakes the linear motor by maintaining an open state;
An elevator control device comprising:

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